Electrical resistance device



Oct. 18, 1 932. B. O. TEMPLETON 1,383,098

' ELECTRICAL RESISTANCE DEVICE 1 Filed July 1. 1950 .FIG. 3

INVENTOR 8.0. TEMPLE TON ATTORNEY ,Winding machine,

and an arm mounted on the hub extends Patented Oct. 18, 1932 UNITED STATES PATENT orries- BRYCE o. T MPLETOR,

I PHONE LABORATORIES, INCORPORATED,

NEW YORK Application filed July 1, 1

This invention relates to electrical resistance devices for use in the radio art or elec-' trical testing apparatus and the like.

The object of this invention is to provide a'resistance of this character which will be simple, cheap to manufacture, efiicient in operation and wherein the component parts are easily assembled together or taken apart.

According to this invention resistance elements are formed by winding, as on a toroidal wires on completely closed rings of insulating material which form the cores of the elements. These elements are placed on a mounting which consists of a pair ofdisc wheels each having portions ar ranged to cooperate with similar portions in a spacer ring for holding the resistance elements in coaxial relation. The discs have flanged portions which cooperate'w'pth the spacer ring for effecting side pressure against the resistance elements when the discs are secured togetherwhich operation is effected through the tightening of a nut screw. engaging a hub on which the discs are mounted through keyways in the disc wheels between them and the spacer ring for preventing relative movement and to serve as a stop for limiting the angular movement of the coils under the manual operation of a 'knob which is mounted on one end of an operating shaft. The disc wheels are provided with means for mounting wire terminals in a manner to protrude outwardly from one side of one of the discs for connecting the coils in theirassociated circuit.

In'the drawing: Fig. 1 is an assembly view shown in perspective; 7

Fig. 2 is an exploded view thereof; Fig. 3 is across .sectional view of. Fig. 1; Fig. 4 is a side assembly view of the resistance showing its operating mechanism; and 4 Fig. 5 is a front view of Fig. 4:. I In the drawing andll indicates similar discs each having a central aperture 12 of the resistance arranged to fit over a hub member 13 which is used for securing the'component parts of posite sides Similarly,

0F QUEENS VILLAGE, NEW YORK, ASSiGNOR T0 BELL TELE- or NEW YORK, N. Y.,-A CORPORATION or ELECTRICAL RESISTANCE DEVICE 930. Serial No. 465,101.

22 of-insulating material on which the resistance wire 23 is coiled. Similarly on'the cylindrical portion oat disc 11 is mounted a resistance element R of a construction similar to that of the resistance element R and comprises the core 24: and the resistance wire 25' coiled thereon. These resistance elements may be coiled on atoroidal winding machine.

On the cylindrical p 10' and 11 and in position intermediate rtions 21 of discs these .discs there is mounted a spacer ring 26 of a diameter simllar to that of flange portions 19 of discs 10 and 11. This ring is provided for imparting sidewise pressure on the re-- sistance elements R and R5 upon the tightening of nutscrew 27-on the threaded portion of hub 13, when the parts are in assembled position as shown in Fig. 1. The hub 13 carries at its other end a right angled lever 28 which engages keyways 29, 30 and 31 in the disc 11; the spacer ring'26 and the disc 10, respectively, for' maintaining these parts and the resistance elements carried thereby against relative movement one with respect to the other.

The spacer ring 26 is provided on two opwi h tangentially disposed grooves 32 and 33 each provided for leading the ends of the resistance wires 23 and 25 toward their respective terminals 16'-17 and 34r-35 to which by soldering. As shown in Figs. 1, 2 and 5 the ends of terminals'1617 extend through respective holes 36 and 37 in the disc 11. the ends of wire 25 of'resistance R are connected to the terminals34 and carried-by disc 11, these pairs of terminals being provided for connecting the resistance wires 23 and .25 in their energizing circuit in a well known manner.

The resistance unit thus formed is mounted on the end of a shaft 38 which is rotatably mounted in a bracket 39; This bracket has an arm 40 on the free end of which is'mounted an insulating block 41 provided for-supporting a brush 42. This brush is provided with a roller 43 which bridges the resistance elements R and- R the roller being mount- Fig. 4. A knob 50 secured to the other end" of the shaft 38 is provided for rotating the resistance an angular distance defined by the stop 48 and the end'of arm 28 as shown in Fig. 4 and a spring washer 51 is provided between the hub 13 and the bracket 39 for frictionally maintaining the resistance in its adjusted position withrespect 'to the bridgcombination with toroidal shaped resistance coils, of a pair of disc wheels, a spacer ring, said wheels and said rin cooperating to form a mounting for each 0 said coils, a hub for said mounting, means carried by said hub and protruding through said wheels andsaid ring, a bracket, a shaft rotatably mounted in said bracket and secured at one end to said hub, a brush mounted on said bracket in engaging each of said coils, a knob mounted on the other end of said shaft for changingthe position of said coils with respect to said brush, and a stop mounted on said bracket cooperating with said means for limiting the movement of said coils with respect to said brush.

In witness whereof, I hereunto subscribe my name this 28th day of June, 1930.

" BRYCE O. TEMPLETON.

,ing roller which position is indicated by a dial 52 in cooperation with an indexmember 53 mounted on the panel or board 54.

What is claimed is: f c 1. In an electrical resistance device, a pair of plates each having a plurality of shoulder portions, a spacer ringmounted on a number of said portions and coopeixating'with the other portions to form grooves, resistance coils mounted in said grooves, means for securing said ring to said platesand said coils on said portions, a stationary arm having a.

roller engaging each of said coils and means i for moving said coils with respect to said I roller.

.2. In an electrical resistance device, a

pair of plates, a spacer ring interposed be-- tween said plates and arranged to form a plurallty of clr'cular grooves, resistance co1ls 111 said grooves, terminals carried by said plates, the terminals of one plate extending through r the other plate," a keyway in said ring and in each of saidplates, a hub for mounting said plates, and means carried by said hub protruding through said keyways for holdi ng said plates and said rings against relativemovement one with respect to the other. 4

3. In an electrical resistance device, of discs, portions, a ring engaging one shoulder portion in each disc, the other shoulder portions cooperating to form a plurality of annular grooves, a toroidal shaped coil mounted in each groove, fastening means for securing said cores on said discs, and said ring, and means carried by the first mentioned means a pair each having a plurality of shoulder for preventing therel'ative movement of said discs and said ring.

4. In an electrical resistance device, the i 

